
class Calculator(object):
    def __init__(self,number):
     self.number = number
    def __add__(self,other):
     self.number = self.number + other
     return self.number
    def __sub__(self,other):
     self.number = self.number - other
     return self.number
    def __mul__(self,other):
     self.number = self.number * other
     return self.number
    def __truediv__(self,other):
     self.number = self.number / other
     return self.number
calculator = Calculator(10)
print(calculator+5)
print(calculator-5)
print(calculator*5)
print(calculator/5)